These are the newer CASE-GARD ammo boxes. Made of virtually indestructible polypropylene that will not warp, crack, chip, peel, expand or contract, MTM CASE-GARD rifle ammunition cases are still the first choice of rifle enthusiasts throughout the world. Full length mechanical hinge that is guaranteed for 25 years. Snap-Lock latch protects contents from accidental spilling. Textured finish makes it easier to grip and harder to scratch. In the late 1960's, the original RS-S-50 was designed specifically for bench rest shooters. The CASE-GARD 50's, are now available in eight sizes will hold .22 Hornet to 375 Remington Ultra Mag., with each cartridge resting in its own individual compartment. Each CASE-GARD 50 ammo box is supplied with a load label for recording load and sight data. All rounds listed as bullet up, unless noted. See ammo box charts for more calibers. All MTM Case-Gard ammo boxes are MADE IN USA in our factory in Dayton Ohio. We now use a full length mechanical hinge on most of our R-50's.RS-50 17 Fireball, 17 MACH 4, 17 / 221 / 222 / 223 Rem., 204 Ruger, 218 Bee, 222 Rem. Mag., 223 Rem. HP, 25-20 Win., 300 Blackout, 300 Sherwood, 300 Wisper, 32 Ideal, 32 / 401 Win. S.L., 351 WSL, 38-55 Win., 5.56x45, 6x47, 6mm TCU, 6mm-223 Rem., 7.62 x 37 Musang. Max. OAL= 2.65" Photo shown contains two boxes highlighting the mechanical hinge.